I got most of the components in the braking system (pads, rotors, bearings, calipers.... everything excepts hoses) replace about 1 yr 10k miles back from local Just brakes

Recently I observed that when I apply the brakes I found that the pedal floor's on constant force.

The brake fluid level seems to be at normal/max level, so I am not suspecting any leak in the system.

However, I am suspecting the following:
- Air has got into the system and am planning on bleeding the brakes.

Any other suggestion as to what else could be wrong, please advice.

Thanks!!